The word "bullet" in Latin is primarily derived from the Latin word "bulla," which means a "round thing" or "knob." This Latin root passed into French as "boule" and then into English as "bullet," originally signifying a small round metal projectile fired from a gun. In more direct Latin translations for "bullet," words like "globus" (meaning a sphere or ball), "glans" (meaning an acorn or nut-like shape), and "pila" (meaning a ball or sphere) are used to convey the idea of a bullet as a small round object or projectile.
Hence, the Latin meaning is centered on the shape "round thing" or "small ball."